Blichmann Beer Gun Setup Question

I have a separate 5lb CO2 tank and regulator that I will be using independently with my beer gun. On the exit side of the regulator, I have a "T" with one tube going to the keg and the other to the beer gun. MY QUESTION: Is it mandatory to have cut-off valves behind the "T" or is that only needed for a single regulator with a dual manifold? I am excited to try out the beer gun this evening but want to make sure I am not over looking anything.

Cheers!

You shouldn't need a cutoff with the beergun. Turn your pressure down farther than you think when you start bottling. I usually bottle all of mine around 6-8psi. You'll love the beergun.